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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr for the latest information on EPA's New Source Review program.

July 7, 1986 Prevention of Significant Deterioration (PSD) Definition of "Modification" 4.32

The memo discusses why a major modification would result from the replacement of wet scrubbers with baghouses that would improve control of particulate matter, but allow a significant net increase of sulfur dioxide emissions. The proposed change would be subject to PSD review. The memo also discusses whether the modification requires review under NSPS regulations.

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